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|  MIL-R-63997B(AR)
Barrel chamber.
b.
Insert the cleaning rod section and
chamber brush that has been dipped in cleaning
solvent into the chamber and use reciprocating
plunge strokes and rotational 3600 motions.
Dry
chamber with cleaning swabs.
Barrel extension.
c.
Using a small bristle brush that
has been dipped in cleaning solvent, clean the
locking lugs in the barrel extension.
R e m o v e excess
cleaning solvent.
B o l t c a r r i e r group.
d.
With the exception of the bolt
carrier key, bolt rings, extractor spring and the
ejector, disassemble all parts, wash these parts in
cleaning solvent and remove all carbon deposits.
Particular attention should be given to the areas
under the face of the extractor and behind the three
rings on the bolt.
Clean the bolt carrier key hole
with a worn bore brush that has been dipped in
cleaning solvent by rotating the brush clockwise
(repeat several times until clean). Remove excess
solvent and dry.
.
Upper receiver.
e.
Clean with cleaning solvent and
remove all powder fouling. Clean the protruding gas
tube using a bore brush attached to a section of the
cleaning rod.
Saturate the brush with cleaning
solvent.
(Do not use any type of abrasive material
to clean the gas tube.
Remove excess cleaning
solvent.)
Lower receiver. Remove all carbon residue from lower
f.
receiver group assembly using cleaning solvent.
Drain excess solvent from lower receiver cavity and
dry.
The twenty (20) 30 round magazines used
4 . 7 . 8 . 2 Magazine.
i n e a c h r i f l e shall be numbered and used in rotation during this
Each -
test.
Magazines shall be fully loaded for each use.
magazine used during this test shall be cleaned at the specified
cleaning interval for the rifle with a cleaning solvent in
accordance with MIL-C-372 and blown dry with prepared compressed
air.
The following measurements shall be
4.7.8.3 Measurements.
made during this test:
Headspace for rifles being fired with 30
Headspace.
a.
round magazines shall be measured and recorded at
the beginning of the test and at the completion of
After the 50th cycle, the headspace
the 50th cycle.
shall not be more than .0028 inch greater than the
initial measurement and shall not exceed .0024 inch
over maximum.
48
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